21492066 has 16 divisors (see below), whose sum is σ = 43899264. Its totient is φ = 7011504.

The previous prime is 21492061. The next prime is 21492067. The reversal of 21492066 is 66029412.

It is not an unprimeable number, because it can be changed into a prime (21492061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37825 + ... + 38388.

It is an arithmetic number, because the mean of its divisors is an integer number (2743704).

Almost surely, 2^21492066 is an apocalyptic number.

21492066 is an abundant number, since it is smaller than the sum of its proper divisors (22407198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21492066 is a wasteful number, since it uses less digits than its factorization.

21492066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76265.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 21492066 is about 4635.9536235817. The cubic root of 21492066 is about 278.0306799810.

The spelling of 21492066 in words is "twenty-one million, four hundred ninety-two thousand, sixty-six".